129687343 has 4 divisors (see below), whose sum is σ = 132134328. Its totient is φ = 127240360.

The previous prime is 129687319. The next prime is 129687361. The reversal of 129687343 is 343786921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129687343 - 2⁹ = 129686831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129687343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129687443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223413 + ... + 1223518.

It is an arithmetic number, because the mean of its divisors is an integer number (33033582).

Almost surely, 2^129687343 is an apocalyptic number.

129687343 is a deficient number, since it is larger than the sum of its proper divisors (2446985).

129687343 is an equidigital number, since it uses as much as digits as its factorization.

129687343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446984.

The product of its digits is 217728, while the sum is 43.

The square root of 129687343 is about 11388.0350807328. The cubic root of 129687343 is about 506.1732587430.

The spelling of 129687343 in words is "one hundred twenty-nine million, six hundred eighty-seven thousand, three hundred forty-three".